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Help...Gaggia TS or Expobar Minore?

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  • TC
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    In the interest of keeping things nice, Im locking this thread down.

    Leave a comment:


  • kaanage
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Sure pal

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  • Dimal
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    You figure it out mate, you seem to have everything else figured out,

    Mal.

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  • kaanage
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Anomaly? If you are talking about the preinfusion without mains head pressure, then there is no anomaly.

    But a really good check would be if one of the MinoreII owners would preinfuse and then remove the PF from the group and knock out the puck. The level of preinfusion would be obvious - if Im wrong, then Ive learnt something!

    (long time gap during edit)

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  • Dimal
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Originally posted by kaanage link=1181199671/15#28 date=1181782703
    There was a very interesting experiment done on alt.coffee a while ago with full commercial vs prosumer machines (I think Greg Scarce was involved - could have been Barry Jarrett) and they came to the conclusion that preinfusion only really works with a fully plumbed in machine since the mains pressure forces a decent amount of water into the puck. This allows the puck to gently expand to the showerscreen before water gets pumped in, which is the whole point of preinfusion. With tank machines, only a small dribble of water will seep into the top of the puck, mainly through capilliary action, in any reasonable pre-infusion period so the preinfusion has very little chance of affecting the shot.
    Hmmm,

    Only partly true as it doesnt take into account where this "anomaly" is recognised beforehand and engineered accordingly,

    Mal.

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  • kaanage
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Originally posted by Mal link=1181199671/15#24 date=1181721423
    It also has a very elegant design for managing the actual shot pour with pre-infusion as well.
    There was a very interesting experiment done on alt.coffee a while ago with full commercial vs prosumer machines (I think Greg Scarce was involved - could have been Barry Jarrett) and they came to the conclusion that preinfusion only really works with a fully plumbed in machine since the mains pressure forces a decent amount of water into the puck. This allows the puck to gently expand to the showerscreen before water gets pumped in, which is the whole point of preinfusion. With tank machines, only a small dribble of water will seep into the top of the puck, mainly through capilliary action, in any reasonable pre-infusion period so the preinfusion has very little chance of affecting the shot.

    That was their conclusion and it makes sense to me (Ive added a little to the analysis).

    I would expect the MinoreII to be able to outperform quite a few commercial machines, within its heating capacity, since the brew boiler makes it inherently more temperature stable than a direct HX machine (the vast majority of commercial machines).

    Originally posted by Thundergod link=1181199671/15#27 date=1181741667
    I only have to empty mine about once a week.
    Do you ever find an ecosystem developing by the time you dump the drip tray?

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  • Thundergod
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    I have to agree with you there Baristacrat re the drip tray.
    I only have to empty mine about once a week.

    Leave a comment:


  • Baristacrat
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Yar yar, have knocked out swags of coffees in a sitting on my Minore. Works like a charm. With a skilled operator  (ie I consider myself to be responsible for any crap that comes out of it, not machine function) this machine produces coffee equivalent to most commercial machines I have worked with.

    But really, the number of posts on this machine that criticise the stumpy legs.  Anyone would think that they were integral to coffee production or it was an arranged marriage. I cant understand why more comments arent made about the Minores CAVERNOUS drip tray. Surely this is worthy of some Hollywood actress allegories - it certainly made me purchase the Minore over less well endowed machines.  8-)

    Across the range of prosumer machines in this class, there will be a point of issue that can be raised about all of them - aesthetic, boiler, PID, deformed legs, whatever. At the end of the day, they all brew great espresso, when used properly, and will give years of service commensurate with the price point.  Ya just have to decide whether you are a legs man or a tray man. ;D

    Leave a comment:


  • fatboy_1999
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Ive had 2 large gatherings in the last 3 months where weve made ~50 coffees each time.

    The machine performed magnificently in my opinion.

    To me, it was a wonderful thing to be able to knock out drink after drink with very little effort.

    Even the 4 coffees at the end of dinner with friends is a good feeling. All done inside 5 minutes.

    Some friends are even getting adventurous and asking for espresso, long black or machiattos.

    All feedback has been positive thus far, but they are my friends, so they may not complain even if I served a bad one.

    In short, Im happy with it!

    Brett.

    Leave a comment:


  • Dimal
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Yes kaanage,

    That is one aspect of the advantages/disadvantages of using an E-61 variant group on a machine like the Minore II... It also has a very elegant design for managing the actual shot pour with pre-infusion as well. Other manufacturers have come up with pseudo pre-infusion techniques in their design but I dont think any of them do it as well as the E-61 and siblings.

    It would be interesting to hear from Minore owners who have had occasion to use their machines to supply groups of people at large gatherings, etc to gain an insight into the machines actual performance, rather than its theoretical performance...

    Mal.

    Leave a comment:


  • kaanage
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Originally posted by 2muchcoffeeman link=1181199671/15#21 date=1181709935
    2. The offset from the display to actual group temp is settable so an accurate indication can be obtained.
    Again, this is a workaround for the group being used in a situation it was not designed for.

    And it is not a perfect solution as the offset may be set for the group being cool when idle but then the boiler temp is too high! For a single shot, the inherent stability of the E61 head (its great strength) will damp the temperature rise so that the shot temp is not too high but if shots are pulled in a fairly rapid succession, then the group head temp will rise to that of the boiler so the shot temps will be too high.

    I am not saying that the MinoreII is at all bad - it is far, far more temp stable than most machines. What I am saying is that it could easily be better for less cost and lower complexity (I like elegant solutions).

    Originally posted by 2muchcoffeeman link=1181199671/15#21 date=1181709935
    1. Its not a PID, Its more like a fridge controller. Calibration to + or - 1 degree C
    I had forgotten that Expobar used a simple temp controller rather than a PID to control the brew boiler temp. This is an example of clever design with appropriate technology being used. The use of the steam boiler as a preheat (via HX) for the brew boiler prevents big temp swings in the brew boiler when fresh water enters so a simple, cheap controller can be used rather than a more complex and expensive PID.

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  • Dimal
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Yep,

    Thats correct Chris, from what Ive been able to dig up around the traps, the Minore II uses a simple Proportional controller and with the ability to offset the actual error read on the display, it works extremely well,

    Mal.

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  • TC
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Originally posted by kaanage link=1181199671/15#18 date=1181614390
    The MinoreII is a good example of technology applied inappropriately. The E61 group head is desgined to themosyphon overtemp water from a HX to prevent the group getting cold when idel. In practise, it usually works too well and the group is too hot an requirea a cooling flush before use if it has been idling.

    With the MinoreII, there is a group boiler that is controlled by a PID so fairly precise temps can be set but because the E61 group works on a temperature differential, it ends up being cool (plus it wastes a small amount of power by providing a heat loss path from the brew boiler) so you still need a fluch if it has been idle but to heat it up rather than to cool it down.

    A group on boiler design would have been much more appropriate for this machine as it would stay very close to the boiler temp at all times but it probably wouldnt look as appealing.
    Agreed that the Minore requires a flush and that a saturated group would have been great....but then it might look like a GS3!

    2 points of correction on this one Greg:

    1. Its not a PID, Its more like a fridge controller. Calibration to + or - 1 degree C
    2. The offset from the display to actual group temp is settable so an accurate indication can be obtained.

    regards

    Chris

    Leave a comment:


  • kaanage
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    Originally posted by kaanage link=1181199671/15#18 date=1181614390
    The MinoreII is a good example of technology applied inappropriately.
    All this applies equally to the Isomac Zafirro - form over function.

    Leave a comment:


  • ozscott
    replied
    Re: Help...Gaggia TS or Expobar Minore?

    "Guess the trick would be to pretend youre seeing Uma every time you look at a MinoreII. "

    - not good for the concentration! Kill Bill one and two just could not have been made with anyone else!

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